摘要
以宁夏退化荒漠草原优势植物牛心朴子、乳浆大戟、甘草和牛枝子为对象,分析放牧干扰对植物的比叶面积(specificleafarea,SLA)、叶干物质含量(leafdrymattercontent,LD-MC)、叶面积和叶干质量等叶性状的影响,探讨荒漠草原生态系统中不同物种对环境改变的响应和适应对策.结果表明:随着放牧强度的降低,牛心朴子、乳浆大戟、甘草和牛枝子的SLA总体呈显著降低的趋势;SLA在不同放牧强度间差异显著,而LDMC则无显著差异.不同植物的叶性状相关性存在差异,牛心朴子和甘草的SLA和LDMC呈显著负相关,而乳浆大戟和牛枝子的SLA和LDMC呈正相关.牛心朴子、甘草、乳浆大戟和牛枝子的SLA对生存环境改变的反应比LDMC更敏感.植物的SLA可以作为荒漠草原植物资源利用对策的指示指标.
This paper studied the effects of grazing disturbance on the specific leaf area （SLA）, leaf dry matter content （LDMC）, leaf area, and leaf dry mass of dominant plant species Cynan- chum komarovii, Euphorbia esula, Glycyrrhiza uralensis, and Lespedeza potaninii in desert steppe of Ningxia, Northwest China, aimed to approach the responses and adaptation strategies of different plant species in desert steppe to the environmental change. With the decrease of grazing intensity, the specific leaf area （SLA） of the four dominant species presented a decreasing trend. Under dif- ferent grazing intensities, the SLA of the four dominant species had significant differences, while the LDMC didn＇ t. There existed definite differences in the interrelationships of leaf traits among different plant species. For C. komarovii and G. uralensis, there was a significant negative relation- ship between SLA and LDMC, for E. esula and L. potaninii, there was a positive relationship be- tween the two parameters. The changes in the leaf traits in response to grazing intensity suggested that the SLA could be more sensitive to the environmental change than LDMC, and the SLA could be used as an indicator of resources use strategies of plants in desert steppe environments.
出处
《应用生态学报》
CAS
CSCD
北大核心
2012年第11期2991-2996,共6页
Chinese Journal of Applied Ecology
基金
国家自然科学青年基金项目(31000214)
高等学校博士学科点专项科研基金项目(20106401120001)
国家科技支撑计划项目(2010BAC07B03)资助
关键词
荒漠草原
放牧干扰
比叶面积
叶干物质含量
desert steppe
grazing disturbance
specific leaf area
leaf dry matter content.
